mpegtsmux: generate proper timecode for JPEG 2000 stream using GstVideoTimeCode API
Submitted by Aaron Boxer
Currently we rely on PTS, which is not ideal.
Use GstVideoTimeCode instead to generate a correct timecode if there is no meta with an actual timecode on the stream.
Also, need to forbid variable frame rate 0/1 in caps
See https://bugzilla.gnome.org/show_bug.cgi?id=753323 for (lots!) more details.
Also, should document a few of the j2k fields: Fic, Fio, etc.